Enter a new era where time is finally on your side. Meet our new Chronologiste innovation: the Overnight Youth Serum, powered by our Caviar of Longevity: Pro-Xylane™ & Ochrophyta Algae. Designed to reverse five signs of hair aging in a single, transformative night, it completes our youth-revitalizing ritual for nocturnal care that works while you rest. By morning, wake up to fuller, healthier, and smoother hair. #Kerastase #Chronologiste #HairLongevity #HairCare #LuxuryHaircare